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  Subjects -> CHEMISTRY (Total: 846 journals)
    - ANALYTICAL CHEMISTRY (47 journals)
    - CHEMISTRY (596 journals)
    - CRYSTALLOGRAPHY (22 journals)
    - ELECTROCHEMISTRY (26 journals)
    - INORGANIC CHEMISTRY (42 journals)
    - ORGANIC CHEMISTRY (45 journals)
    - PHYSICAL CHEMISTRY (68 journals)

ANALYTICAL CHEMISTRY (47 journals)

Showing 1 - 0 of 0 Journals sorted alphabetically
Accounts of Chemical Research     Full-text available via subscription   (Followers: 79)
Acta Analytica     Hybrid Journal   (Followers: 7)
Advances in Analytical Chemistry     Open Access   (Followers: 19)
American Journal of Analytical Chemistry     Open Access   (Followers: 27)
Analytica Chimica Acta     Hybrid Journal   (Followers: 40)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 33)
Analytical Chemistry     Full-text available via subscription   (Followers: 213)
Analytical Chemistry Insights     Open Access   (Followers: 17)
Analytical Chemistry Research     Open Access   (Followers: 1)
Analytical Letters     Hybrid Journal   (Followers: 11)
Analytical Spectroscopy Library     Full-text available via subscription   (Followers: 9)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 9)
Biomonitoring     Open Access  
Chinese Journal of Analytical Chemistry     Full-text available via subscription   (Followers: 3)
Combinatorial Chemistry - an Online Journal     Open Access   (Followers: 2)
Comprehensive Analytical Chemistry     Full-text available via subscription   (Followers: 4)
Critical Reviews in Analytical Chemistry     Hybrid Journal   (Followers: 24)
Current Analytical Chemistry     Hybrid Journal   (Followers: 7)
Drug Testing and Analysis     Hybrid Journal   (Followers: 5)
Electroanalysis     Hybrid Journal   (Followers: 5)
Field Analytical Chemistry and Technology     Hybrid Journal   (Followers: 4)
Handbook of Analytical Separations     Full-text available via subscription   (Followers: 1)
Handbook of Thermal Analysis and Calorimetry     Full-text available via subscription  
International Journal of Analytical Chemistry     Open Access   (Followers: 21)
International Journal of Chemical and Analytical Science     Full-text available via subscription   (Followers: 3)
International Journal of Environmental Analytical Chemistry     Hybrid Journal   (Followers: 6)
International Journal of Polymer Analysis and Characterization     Hybrid Journal   (Followers: 5)
Journal of Analytical & Bioanalytical Techniques     Open Access   (Followers: 6)
Journal of Analytical Atomic Spectrometry     Full-text available via subscription   (Followers: 10)
Journal of Analytical Chemistry     Hybrid Journal   (Followers: 18)
Journal of Electroanalytical Chemistry     Hybrid Journal   (Followers: 4)
Journal of Essential Oil Research     Hybrid Journal   (Followers: 1)
Journal of Radioanalytical and Nuclear Chemistry     Hybrid Journal   (Followers: 4)
Journal of Thermal Analysis and Calorimetry     Hybrid Journal   (Followers: 22)
Main Group Metal Chemistry     Hybrid Journal   (Followers: 1)
Microchemical Journal     Hybrid Journal   (Followers: 3)
Nigerian Journal of Chemical Research     Full-text available via subscription  
Phytochemical Analysis     Hybrid Journal   (Followers: 2)
Polish Journal of Chemical Technology     Open Access   (Followers: 1)
Reviews in Analytical Chemistry     Hybrid Journal   (Followers: 8)
Sample Preparation     Open Access  
Surface and Interface Analysis     Hybrid Journal   (Followers: 13)
Techniques and Instrumentation in Analytical Chemistry     Full-text available via subscription   (Followers: 5)
TrAC Trends in Analytical Chemistry     Full-text available via subscription   (Followers: 52)
Trends in Environmental Analytical Chemistry     Hybrid Journal   (Followers: 2)
Vibrational Spectroscopy     Hybrid Journal   (Followers: 11)
World Journal of Analytical Chemistry     Open Access   (Followers: 1)
Journal Cover Journal of Analytical Chemistry
  [SJR: 0.33]   [H-I: 19]   [18 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1608-3199 - ISSN (Online) 1061-9348
   Published by Springer-Verlag Homepage  [2281 journals]
  • Selective photometric determination of low conentrations of selenium(IV)
           and selenium(VI) in bottled drinking water
    • Abstract: Abstract A procedure is developed for the selective photometric determination of selenium(IV) in bottled drinking water by the oxidation of Methylene Blue in 1 M HCl to colorless decomposition products and of selenium(VI) by its interaction with the specified reagent at pH 5–6 with the formation of a colored ion pair. The limits of detection are 1 and 0.8 µg/L, respectively. At the concentration of selenium(IV) 2 µg/L, the admissible weight ratios are: SeO4 2-, Br3 - (1: 20); Br– (1: 60); I–, IO3 - and IO4 - (1: 100). At equal concentration of selenium(VI), the following species: SeO4 2-(1: 20); Br3 -, Br–, I–, IO3 -, and IO4 - (1: 100) do not interfere with the determination. Other anions and cations present in highly mineralized waters do not interfere with the determination. The relative error of determination is 8–10% in the concentration range 2–10 µg/L of selenium(IV) and selenium(VI) and does not exceed 5% in their concentration range of 10–100 µg/L.
      PubDate: 2016-04-01
       
  • Extraction procedures in gas chromatographic determination of pesticides
    • Abstract: Abstract Pesticides are necessary for increasing agricultural productivity; however, their enormous use contaminates air, water and food. Among various organic pesticides, organochlorine pesticides (OCPs) are most persistent; and though their use is banned, they are still used illegally. In contrast to OCPs, organophosphorous pesticides are less persistent and used most extensively, while synthetic pyrethroid pesticides are the least toxic and used as insecticides. Extensive use of these pesticides is vulnerable to the ecosystem. Various extraction methods are used worldwide both by the regulatory bodies and private laboratories for the determination of multi-residue pesticides in leafy vegetables. This mini review presents an update on extraction procedure in gas chromatographic methods of pesticides analysis in various samples with special emphasis on leafy vegetables. We have covered six years of work from 2008–2013, discussing various extraction methods and their applications.
      PubDate: 2016-04-01
       
  • Combination of microwave heating extraction and dispersive liquid-liquid
           microextraction for the determination of nitrosoamines in foods using
           gas-liquid chromatography with a mass-spectrometric detector
    • Abstract: Abstract A method has been developed for the determination of trace amounts of seven nitrosoamines (N-nitrosodimethylamine, N-nitrosomethylethylamine, N-nitrosodiethylamine, N-nitrosopyrrolidine, N-nitrosodipropylamine, N-nitrosopiperidine, and N-nitrosodibutylamine) in food using gas-liquid chromatography with a mass-spectrometric detector. The optimum chromatographic conditions were selected: a DB-5MS column, temperature ramp rate 10 K/min from 40 to 250°C, carrier gas flow rate 1 mL/min. Conditions of the extraction of nitrosoamines from samples using microwave heating extraction followed by dispersive liquid-liquid microextraction, ensuring sufficient preconcentration and additional purification of the extract, have been optimized. The linearity ranges for nitrosoamines were (0.5–2.5)–25 µg/kg; the limits of detection were 0.1–0.5 µg/kg (signal-tonoise ratio 3). The method has been applied to the analysis of samples of sausage, smoked chicken meat, and smoked pork. The time of analysis is 1.5–2 h, the relative standard deviation of the results of analysis does not exceed 10%.
      PubDate: 2016-04-01
       
  • Extraction of humic substances from fresh waters on solid-phase cartridges
           and their study by Fourier transform ion cyclotron resonance mass
           spectrometry
    • Abstract: Abstract Humic substances (HS) have been extracted from fresh waters on macroporous adsorbents of different types, Amberlite XAD-8 resin and Bond Elute PPL solid-phase cartridge. Comparative analysis of the extracted samples by ultra-high resolution mass spectrometry demonstrated selectivity of the selected adsorbents to the components of the molecular assembly of HS: the XAD-8 resin has affinity to the higher oxidized aromatic compounds and PPL has affinity to substances of stronger aliphatic character and nitrogen-containing compounds. Because of this fact, a comparison of the molecular composition of HS isolated from various sources must be performed taking into account selective adsorption; therefore, it is necessary to compare the products extracted by the same adsorbent for correct interpretation.
      PubDate: 2016-04-01
       
  • Determination of Rare earth elements in environmental samples by solid
           phase extraction ICP OES
    • Abstract: Abstract A simple sample pre-treatment method for rare earth elements enrichment from environmental water samples prior to optical emission spectrometry determination with inductively coupled plasma (ICP OES) is proposed based on solid phase extraction with octadecyl silica gel modified with 1,2,5,8-tetrahydroxyanthraquinone. Optimal experimental conditions including pH of sample solution, sample volume, type, concentration and volume of eluent were investigated and established. Rare earth elements ions were quantitatively adsorbed from aqueous solution onto octadecyl silica gel modified with Quinalizarin at pH 7.0. The adsorbed ions were eluted with 1.0 mL of 2 M HNO3 and simultaneously determined by ICP OES. Under obtained optimum conditions the calibration curves were linear with the coefficient of variation better than 0.99. The limit of detection of the method for the studied elements was in the range of 0.0004–0.01 ng/mL. The proposed method has a pre-concentration factor of 320–450 in water samples, which results in high sensitivity detection of trace ions. The developed method gave recoveries better than 80% and RSDs less than 15%.
      PubDate: 2016-04-01
       
  • Specific features of the determination of carbonyl compounds in
           atmospheric air
    • Abstract: Abstract It has been shown that the error of the determination of formaldehyde in atmospheric air depends both on the method of measurement of the analytical signal and on the conditions of air sampling. In most cases, the use of HPLC leads to underestimated results, while the application of spectrophotometry leads to overestimated results. A method has been developed for the selective determination of formaldehyde in atmospheric air using HPLC with a fluorescence detector, which can be used as a reference method.
      PubDate: 2016-04-01
       
  • Silica-based mesoporous organic-inorganic nano-hybrid: a novel
           electroceramic nanomaterial for electroanalytical determination of
           selected cardiovascular drugs in human serum
    • Abstract: Abstract Magnetic mesoporous silica was used for electrode modification and electro-oxidation of some cardiovascular drugs. The modified electrode was applied for detection of cardiovascular drugs using cyclic voltammetry, chronoamperometry, and differential pulse voltammetry. The modified electrode shows many advantages as an electrochemical sensor such as simple preparation method without using any specific electron transfer mediator or specific reagent, high sensitivity, excellent activity, short response time, long term stability and remarkable antifouling property toward for cardiovascular drugs and its oxidation product. Finally, the applicability of the sensor for determination of the selected drugs in human serum samples has been successfully demonstrated.
      PubDate: 2016-04-01
       
  • Potential of gas chromatography in the determination of low-volatile
           dicarboxylic acids
    • Abstract: Abstract The analysis of published data shows that the results of the gas chromatographic determination of low-volatile polar aliphatic dicarboxylic acids are rather poorly reproducible. A considerable part of the published values of their retention indices appears to be erroneous. The experimental verification of the capabilities of gas chromatography and gas chromatography–mass spectrometry demonstrates that some of the compounds of this series (for example, glutaric acid) can be determined without decomposition; others are characterized by the formation of products of interaction with solvents (oxalic acid), and in some cases, the only detectable moieties are products of thermal degradation (citric acid).
      PubDate: 2016-04-01
       
  • Mineralization of TiO 2 nanoparticles for the determination of titanium in
           rat tissues
    • Abstract: Abstract In order to draw appropriate conclusions about the possible adverse biological effects of titanium dioxide nanoparticles (TiO2—NPs), the so-called “dose?effect” relationship must be explored. This requires proper quantification of titanium in complex matrices such as animal organs for future toxicological studies. This study presents the method development for mineralizing TiO2—NPs for analysis of biological tissues. We compared the recovery and quantification limits of the four most commonly used mineralization methods for metal oxides. Microwave-assisted dissolution in an HNO3–HF mixture followed by H2O2 treatment produced the best results for a TiO2—NPs suspension, with 96 ± 8% recovery and a limit of quantification as low as 0.9 µg/L. This method was then used for the determination of titanium levels in tissue samples taken from rats. However, our tests revealed that even this method is not sensitive enough for quantifying titanium levels in single olfactory bulbs or hippocampus in control animals.
      PubDate: 2016-04-01
       
  • Magnetic adsorbents based on iron oxide nanoparticles for the extraction
           and preconcentration of organic compounds
    • Abstract: Abstract We summarize data published over the last five years on the approaches and methods used in the synthesis of magnetic adsorbents based on iron oxide nanoparticles. A classification of magnetic adsorbents is proposed; examples of their use in the magnetic solid-phase extraction of organic compounds in the analysis of environmental samples, food, and biological fluids are given.
      PubDate: 2016-04-01
       
  • Methodology of analysis of unseparated mixtures: Interval estimates of the
           total concentration of similar analytes
    • Abstract: Abstract Determination of the total concentration (c Σ) of similar analytes recalculated to a standard substance Xst is a widely used but metrologically incorrect procedure leading to a high uncertainty of the results of analysis. An algorithm is proposed for the interval estimation of c Σ without recalculating to the concentration of Xst. The algorithm takes into account different sensitivities of the determination of analytes of the studied type. No information on the nature and ratio of analytes in the sample is used. The width of the range of possible values of c Σ objectively characterizes the systematic component of the error, it is independent of the choice of Xst, exceeds the width of traditional confidence intervals, and becomes zero at equal sensitivities of the determination of all analytes in a group. The accuracy of interval estimates is supported by the analysis of model mixtures of different types using several methods of measuring the total signal.
      PubDate: 2016-04-01
       
  • Identification and determination of mycotoxins and food additives in feed
           by HPLC–high-resolution time-of-flight mass spectrometry
    • Abstract: Abstract High-resolution time-of-flight mass spectrometry combined with high performance liquid chromatography is proposed for the detection and determination of 25 mycotoxins and 8 food additives (coccidiostats) in animal feed, using simplified and rapid sample preparation. We developed a procedure for the identification and determination of analytes by the standard addition method. The lower limit of the analytical range is 1 (400) µg/kg for mycotoxins; the analytical range for coccidiostats in feed is 10–200 mg/kg. The relative standard deviation of the results does not exceed 10%. The analysis time is 0.5–1 h.
      PubDate: 2016-04-01
       
  • Capabilities of capillary electrophoresis for the determination of
           atenolol and bisoprolol
    • Abstract: Abstract The electrophoretic behavior of hypotensive drugs (bisoprolol and atenolol) under the conditions of varied pH, ionic strength of the leading electrolyte, applied voltage, and temperature has been studied. Possibilities of the application of capillary electrophoresis to the determination of the identity, purity, and amount of the studied drugs in raw materials and finished dosage forms have been discussed.
      PubDate: 2016-04-01
       
  • Gas-chromatographic determination of trace amounts of tetrodotoxin in
           water, drugs, and blood plasma
    • Abstract: Abstract A method has been developed for the determination of tetrodotoxin in water, blood plasma, and drugs at a level of 0.05—1.0 µg/mL. The method is based on the hydrolytic decomposition of tetrodotoxin by a sodium hydroxide solution, extraction of 2-amino-6-hydroxymethyl-8-hydroxyquinazoline using liquid–liquid extraction, preparation of its derivative by reaction with N,O-bis(trimethylsilyl)trifluroacetamide, and the determination of the derivative by gas–liquid chromatography with a mass-spectrometric detector.
      PubDate: 2016-03-01
       
  • Selective photometric redox determination of periodate and iodate ions in
           bottled drinking water
    • Abstract: Abstract method has been developed for the selective photometric redox determination of periodate and iodate ions in bottled drinking water based on redox reactions of analytes with Methylene Blue with different duration of processes, products of which form the analytical signal. The limits of detection for periodate and iodate ions are 0.5 and 0.2 µg/L, respectively. The allowable weight ratios for concomitant ions for (at the analyte concentration 2 µg/L) are as follows: I–, Br–, IO3 –, BrO3 –, ClO–, CIO–, CIO2 –, CIO3 – and CIO4 –(1: 100); and for IO3 – (1 µg/L) are: BrO3 – 2 –, NO (1: 60), CIO–, CIO2 –, (1: 100), and I–, Br–, IO4 –, CIO3 –, and CIO4 – (1: 200). The HCIO3 –, Cl–, and SO4 2- anions and Ca2+, Mg2+, Na+, K2+, and NH4 + cations are macrocomponents of drinking water and at total concentrations up to 10 g/L do not affect the results of analysis. In the concentration range 1–10 µg/L of IO4 – andIO3 –, the total error of determination is 5–7%.
      PubDate: 2016-03-01
       
  • Screening neuraminidase inhibitors from glycosaminoglycan and natural
           extract by capillary electrophoresis
    • Abstract: Abstract An electrophoretically mediated microanalysis (EMMA) method for screening neuraminidase inhibitors in depolymerized glycosaminoglycan and natural extracts is described. In the present method, enzyme and substrate were individually introduced into the capillary as distinct plugs, and then mixed for a short time. Afterwards the voltage was reapplied to separate the product from the unreacted substrate and the natural extract. The measured peak area of the product at 214 nm represents the enzyme activity. The electrophoretic conditions for the enzyme reaction and separation of substrate and product were optimized in this study. Under the optimal conditions, the Michaelis–Menten constant and the inhibitive mechanism of zanamivir were studied, which agreed with the literature data. Furthermore, the inhibitory ratios of enzymatic activity of depolymerized glycosaminoglycan and traditional Chinese drugs were determined. The EMMA method has superiority over traditional assay methods, in not only minimizing the false-positive results but also in simplifying the experimental procedure. Therefore, it could be employed to screen inhibitors from natural sources.
      PubDate: 2016-03-01
       
  • Simple and low-cost electrochemical sensor based on nickel nanoparticles
           for the determination of cabergoline
    • Abstract: Abstract Cabergoline (CAB) is an ergot alkaloid derivative with dopamine agonist activity. In this work for the first time the electrocatalytic oxidation of CAB was carried out with nickel nanoparticles-modified carbon paste electrode using cyclic voltammetry, chronoamperometry, chronocoulometry and amperometry methods. At first, nickel nanoparticles were synthesized by non-aqueous polyol method and these nanoparticles were mixed with graphite powder to form modified carbon paste electrode. The resulting modified electrode was characterized by scanning electron microscope images. In the presence of 0.1 M NaOH a good redox behavior of the Ni(III)/Ni(II) couple at the surface of the electrode can be observed. CAB was successfully oxidized at the surface of the modified electrode. The electrocatalytic oxidation peak current of this drug was linearly dependent on its concentration. The proposed sensor exhibited a high sensitivity and was successfully applied for the determination of CAB in real samples.
      PubDate: 2016-03-01
       
  • Properties of gold electrode modified with dimercaptosuccinic acid and
           electrochemical behavior of copper histidine complex
    • Abstract: Abstract A self-assembled monolayer of meso-2,3-dimercaptosuccinic acid was prepared on the surface of gold disc electrode. The modified electrode was characterized using cyclic voltammetry in copper(II) solution and cyclic voltammetry and electrochemical impedance spectroscopy in the presence of potassium hexacyanoferrate( II)/(III) and hexaammineruthenium (II)/(III) chloride. Binding of copper(II) histidine complex (Cu–His) onto the electrode was successfully achieved for a wide range of tested concentrations, as shown with adsorption transfer stripping voltammetry. Electrode response (logΔI p) was linearly proportional to logc(Cu–His) with correlation coefficient R 32 = 0.9839.
      PubDate: 2016-03-01
       
  • Determination of γ-hexachlorocyclohexane and its metabolites in
           biological samples from rat
    • Abstract: Abstract We have determined γ-hexachlorocyclohexane (lindane) and its metabolites in urine, serum and feces samples from rats using HPLC-UV-Vis and confirmation of mass with matrix assisted laser desorption/ ionization-time of flight (MALDI-TOF) analysis. Samples were collected from rats treated orally with lindane (17.6 mg/kg; 1/5 of LD50) or vehicle for 2 weeks. Lindane and metabolites were extracted from samples with hexane and analyzed. The HPLC–MALDI-TOF is highly sensitive to the point of detecting very low level (5 ppm) of lindane and metabolites. The HPLC-UV-Vis analysis confirmed the presence of lindane in urine (386–1652 ppm), serum (207–371 ppm) and feces (5–74 ppm). Control samples had no peak corresponding to lindane. MALDI-TOF analysis of urine and serum samples showed a major peak at 293 m/z, whereas feces showed a minor peak at 292–293 m/z, which were consistent with the peak obtained for standard lindane (293 m/z). Our data indicates that HPLC-UV-Vis–MALDI-TOF combo method is sensitive for detecting and quantifying lindane and its metabolites in serum, urine and feces. Our results further showed that minor quantities of lindane and metabolites were excreted through feces confirming that the main pathway for excretion of lindane and metabolites is through urine.
      PubDate: 2016-03-01
       
  • Application of artificial neural networks to predictions in flow-injection
           spectrophotometry
    • Abstract: Abstract It is demonstrated that predictions can be obtained in spectrophotometric flow-injection analysis (FIA) based on an experimental parameter, that is, the degree of reaction, which takes into account the hydrodynamic and chemical characteristics of the spectrophotometric reaction used. The search algorithm is based on constructing a model of a chemical-analytical process using a learning artificial neural network that enables the prediction of the degree of reaction for some reagents not studied yet. The trained neural network is used for the a priori evaluation and comparison of a number of reagents for the determination of aluminum by FIA.
      PubDate: 2016-03-01
       
 
 
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